Xcode clang link：构建动态框架（或dylib）不嵌入依赖项 [英] Xcode clang link: Build Dynamic Framework (or dylib) not embed dependencies

问题描述

我正在为iOS构建一个动态框架。它需要从代码或其他库中引用一些符号，但我不想将它们链接到框架中。

这可以在构建静态库时实现，只需要设置搜索路径并确保它们不包含在目标的构建阶段。

但是当构建动态框架或dylib时，此结果未定义符号错误。我尝试过各种链接选项，例如 -l <​​/ code> -weak_library -weak_framework -I -rpath -rpath-link 。

链接命令如下所示：

  clang -arch x86_64 -dynamiclib 
 -isysroot * iPhone_SDK_PATH * 
 * OPTIONS_NOT_IMPORTANT * 
 -install_name @ rpath / Foo.framework / Foo 
 -Xlinker -rpath -Xlinker @ executable_path / Frameworks 
 -Xlinker -rpath -Xlinker @ loader_path / Frameworks 
 -Xlinker -rpath -Xlinker * BUILD_PATH * 
 -mios-simulator-version-min = 7.0 
 -Xlinker -no_deduplicate 
 -Xlinker -objc_abi_version 
 -Xlinker 2 
 -fobjc-arc -fobjc-link-runtime 
 -framework Foundation 
 -single_module 
 -compatibility_version 1 
 -current_version 1 
 -Xlinker -dependency_info 
 -Xlinker * BUILD_PATH * / Foo.build / Objects-normal / x86_64 / Foo_dependency_info.dat 
 -o * BUILD_PATH * / Foo.framework / clang使用ld命令创建最终链接，使用ld命令来创建最终的链接，我检查了手册，发现 -U 和 -undefined 可以忽略未定义的符号。
 
 
 -U symbol_name 
 
 
指定symbol_name没有定义。对于two_levelnamespace，生成的符号将被标记为dynamic_lookup，这意味着dyld将搜索所有加载的图片。
 
 
 b 
 $ b 
 
 
指定如何处理未定义的符号。选项包括：error，warning，suppress或dynamic_lookup。默认为错误。
 
 
 
 
所以最终的解决方案设置为 -Wl ，-undefined，dynamic_lookup 到 OTHER_LDFLAGS ，还要确保搜索路径设置正确。它工作。
 
I’m building a dynamic framework for iOS. It needs reference some symbols from code or other libraries, but I not want link them into the framework.

This can be achieved when build an static library, just setup search path and make sure them not included in target’s build phases.

But when build a dynamic framework or dylib, this result undefined symbol error. I tried all kinds of link options, eg -l -weak_library -weak_framework -I -rpath -rpath-link. But none works.

The link command looks like this:
clang -arch x86_64 -dynamiclib
    -isysroot *iPhone_SDK_PATH* 
    *OPTIONS_NOT_IMPORTANT* 
    -install_name @rpath/Foo.framework/Foo
    -Xlinker -rpath -Xlinker @executable_path/Frameworks
    -Xlinker -rpath -Xlinker @loader_path/Frameworks
    -Xlinker -rpath -Xlinker *BUILD_PATH*
    -mios-simulator-version-min=7.0
    -Xlinker -no_deduplicate
    -Xlinker -objc_abi_version
    -Xlinker 2 
    -fobjc-arc -fobjc-link-runtime
    -framework Foundation
    -single_module
    -compatibility_version 1
    -current_version 1
    -Xlinker -dependency_info
    -Xlinker *BUILD_PATH*/Foo.build/Objects-normal/x86_64/Foo_dependency_info.dat 
    -o *BUILD_PATH*/Foo.framework/Foo

解决方案
clang use ld command to make the final link, I checked the manual and found -U and -undefined can ignore undefined symbols.

  
-U symbol_name               

    
Specified that it is ok for symbol_name to have no definition.  With two_levelnamespace, the resulting symbol will be marked dynamic_lookup which means dyld will search all loaded images.
  
-undefined treatment

    
Specifies how undefined symbols are to be treated. Options are: error, warning, suppress, or dynamic_lookup.  The default is error.
  

So the final solution is set -Wl,-undefined,dynamic_lookup to OTHER_LDFLAGS, also make sure search path set correctly. It works.

                        
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